> For the complete documentation index, see [llms.txt](https://docs.shardspace.app/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.shardspace.app/trading/limit-order-trades/the-limit-order-page/the-order-book.md).
# The Order Book
Because AlphaDex provides the back-end DEX functionality for many front-end exchanges (like ShardSpace) the order book you see shows all the orders existing on AlphaDex and not just those submitted on ShardSpace. When you place either a buy order (in green) below the market 'Price' or a sell order (in red) above the market 'Price' it will get added to the order book. If you submit a buy order above the market price or sell order below the market price these are normally executed asap and are usually not added to the order book. Liquidity depending.
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